Catalog (archive) imagery
Imagery that already exists in the archive — fastest, cheapest path when you can flex on quality parameters.
Catalog imagery already exists. It came from one of two sources: someone else's capture whose exclusivity window has expired and which has been released into the general archive, or a passive capture — the satellite had spare capacity on a pass, was overhead an interesting area, and grabbed frames with no specific order in mind.
When catalog wins
Catalog is the fastest and cheapest option. You search by AOI and date range, preview thumbnails, license the scene, and download. There is no feasibility check, no tasking queue, no weather risk — the image either exists or it doesn't. If the brief is 'anything from the last 18 months showing this mine,' catalog wins every time.
When catalog disappoints
The tradeoff is you take what you get. Cloud cover, off-nadir angle, sun elevation, and capture date are all fixed. If the brief is 'a cloud-free nadir capture from the first week of March,' catalog will disappoint and the right move is tasking.